Sheet-metal shear



Patented Aug. 1, 1916.

6 SHEETS-*QHEET I W. W. IRWIN.

SHEET METAL SHEAR.

APPLICATION min SEPT. 1. 1915.

Patented Aug. 1, 1916.

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SHEET METAL SHEAR.

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SHEET METAL SHEAR.

APPLICATION FILED SEPT. 1, I915.

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SHEET-METAL SHEAR.

Application filed September 7, 1915.

To all whom it may concern Be it known that I, 1min M W. IRWIN, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented a new and usful Sheet Metal Shear, of which the following is a specification.

My invention relates to sheet metal shears, such as are used for trimming the edges of a pack of sheets as they are brought from the mill. Former machines of this character have been provided with but a single knife adapted to trim one edge of the pack with each operation of the shear, thus making four separate operations necessary in order to shear a single pack.

The object of my invention is to provide a sheet metal shear in which is located a pair of knives adapted to be operated in unison to trim two edges of a pack of sheets simultaneously.

A further object is to provide a machine of the character referred to in which means are provided for adjusting the cutting knives with relation to each other in order to cut sheets of different sizes. I

A still further object is to provide means for automatically evening the pack of sheets upon the bed plate before the cutting knives are operated.

A still further object is to provide means for clamping the pack tightly upon the bed plate before the cutting knives are operated.

lVith these objects in view the invention consists in the novel construction and arrangement of parts, hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportion, size and minor details of construction may be made within the scope of the appended claims without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings: Figure 1 is a rear elevation of the shear. Fig. 2 is a top plan view of the same. Fig. 3 is an end elevation thereof. Fig. 4 is a transverse sectional view on the line 4-4E Fig. 1. Fig. 5 is a side elevation, with parts broken away, of the hold down which clamps the pack upon the bed plate. Fig. 6 is an end elevation of the same with parts broken away for the purpose of illustration. Fig. 7 is a sec tion on. line 77, Fig. 5, Fig. 8 is a per Specification of Letters Patent.

Patented Aug. 1, 1916.

Serial No. 49,309.

spective View showing the means of operat mg the eveners. Fig. 9 is a. detail of one of the hand levers for operating the eveners. Fig. 10 is a detail view showing the means of operating the clutch mechanism which controls the shear blades. Fig. 11 is a detail sectional view of the shaft which operates the eveners, showing one of the rock arms.

Similar numerals of reference indicate corresponding parts throughout the several figures of the drawings.

One of the shear blades is carried in a fixed frame comprising the end frames 1 and 2 which are connected at their upper extremities by means of a tie beam 3, said end frames being mounted upon the base A. The other shear blade is carried in a slidable frame consisting of the end frames 4 and 5 which are connected at their tops by means of a tie beam 6, said slidable frame being adjustable with relation to the fixed frame as will be hereinafter described.

J ournaled in the end frames 1 and 2 of the fixed frame is a crank shaft 7 which is connected by means of pitmen 8 to the reciprocating frame 9 which carries the shear blade 10. The frame 9 is mounted for vertical reciprocation in suitable guides 11 which are located upon the end frames 1 and 2. Upon the rear extremity of the crank shaft 7 is fixedly attached a gear 12, said gear meshing with an idler 13 which in'turn meshes with a gear 14 which is mounted upon a crank shaft 15, which is mounted in the end frames 4: and 5 of the movable frame.

The idler 13 is mounted upon a short shaft 16 which is journaled in the links 17 and 18, said links being pivotally mounted upon the crank shafts 7 and thus holding the idler 13 in mesh with the gears 12 and 14 at all times. It will be understood of course that any other suitable device may be employed for causing the crank shafts 7 and 15 to be operated simultaneously, and in unison, as will be hereinafter described. The crank shaft 15 is attached by means of pitmen 19 to the recip rocating frame 20 which carries the shear blade 21, said frame being mounted for vertical reciprocation in the guides 22 mounted upon the end frames 4 and 5. Loosely mounted upon the forward extremity of the crank shaft 7 is a gear 28, said gear being provided with a clutch member 24 adapted to be engaged by the sliding clutch member 25 which is fixed against rotation upon the shaft 7 in the usual manner, said sliding clutch member being connected by a bell crank 26 and link 27 to a pedal 28, this mechanism being of the usual construction. The gear 23 meshes with the pinion 29 which is fixed upon the driving shaft 30, said shaft being provided with the usual loose and tight driving pulleys 31 and respectively. Thus when the pedal 28 is depressed the sliding clutch member 25 will be thrown into mesh with the clutch member 24 carried upon the gear 23, driving the gear 23 through the pinion 29 upon the driving shaft, the crank shaft 7 being thus rotated and the gears 12, 13 and 14 rotating the crank shaft 15, causing the two shear blades 10 and 21 to descend in unison, said shear blades coacting with the cutter bars 33 and 34 respectively which are carried upon the bed plates. 7

The cutter bar 33 is carried upon the fixed bed plate 35, said bed plate being fixedly connected to the end frames 1 and 2, and the cutter bar 34 is carried upon the movable bed plate 36, said movable bed plate being carried between the movable end frames 4 and 5 and adapted to be moved therewith. For the purpose of adjusting the movable frame toward or away from the fixed frame two or more screw threaded shafts 37 are provided, each of said shafts having a bearing in the fixed bed plate 33. The outer extremities of the shafts are journaled in suitable bearings 38. The screw threaded extremity 39 of each shaft is located through a suitable internally screw threaded aperture in the movable bed plate 36. Upon the outer end of each of the shafts 37 is fixedly connected a worm gear 40, said worm gears meshing with worm screws 41 carried upon a shaft 42, said shaft having mounted thereon a gear 43. A counter-shaft 44 is mounted in bearings 45 located upon the base A, a

pinion 46 being mounted upon the countershaft and meshing with the gear 43. A pair of clutch pulleys 47 and 48 are loosely mounted upon the counter-shaft 44 and are adapted to be rotated in opposite directions from any source of power, and a sliding clutch member 49 controlled by a hand lever 50 is adapted to fixedly connect either of the pulleys 47 or 48 to the counter-shaft in the usual manner, thus rotating the screw threaded shafts 39 so as to move the mov-' able frame toward or away from the fixed frame as desired.

For the purpose of holding the bed plates 35 and 36 rigid when the shear blades 10 and 21 are operated, a series of screws 51 are located at intervals through screw threaded apertures 52 in the bed plates 35 and 36, said screws being provided with squared heads so that they may be adjusted by means of a socket wrench. It will be noticed that the outer extremities of the apertures 52 are of larger diameter than the inner screw threaded portion to allow for the wrench to be placed therein. Thus as the movable frame is moved toward and away from the fixed frame the bolts 51 may be adjusted as better illustrated in Fig. 4, the ends of the bolts abutting, thus preventing the bed plates from springing toward each other when the shear blades descend.

The packs of sheets to be sheared are carried to the shear upon a conveyer chain 53, said chain passing over a sprocket 54 which is journaled in a bearing 55 mounted upon one of the end frames.

In order to center the packs upon the bed plates an evener is provided consisting of a pair of angle bars 56 supported by means of links 57 pivoted thereto at 58, each of said links being pivotally connected to a post 59, said posts being supported upon the shear blade frames 9 and 20. A shaft 60 is jour naled in suitable bearings 61 and 62 upon the end frames 2 and 5 respectively. A rock arm 63 is slidably mounted upon the shaft 60 between the bearings 62, said rock arm being provided with a lug 64 adapted to slide within a lateral groove 65 in the shaft. A link 66, pivotally connects the rock arm 63 to the adjacent angle bar 56. The remaining angle bar 56 is connected by means of a link 67 to a hand lever 68, said hand lever being loosely mounted upon the shaft 60 be tween the bearings 61 and provided with a spring detent 69 and adapted to engage a ratchet wheel 70, which is fixedly mounted upon the shaft 60. An operating lever 71 is fixedly connected to the shaft 60. When a pack has been conveyed into the shear it is necessary to center the pack upon the bed plates before the shear blades are allowed to descend and this is accomplished by means of the hand lever 71. By operating this hand lever the shaft 60 is rocked and through the links 66 and 67 the angle bars 56 are moved toward or away from the side edges of the pack of sheets as the case may be, thus centering the pack upon the bed plates and beneath the shear blades. In cases, however, where one side edge of the pack is more irregular than the other side 7 7 edge it is necessary to shift the pack slightly to one side upon the bed plates in order to get an even edge upon the sheets when they are trimmed and for this purpose the hand lever 68 is provided. By operating the hand lever 68 and the hand lever 71 both, one of the angle bars 56 may be moved farther toward or away from the adjacent bed plate, as desired. I

In order to provide for holding a pack firmly upon the bed plates after it has been properly adjusted by means of the evener, a device which might be termed a hold down is provided. Four standards 72 located at the corners of the machine are tied together at their upper extremities by means of a pair of longitudinally disposed I-beams 73 and a second pair of superimposed transversely disposed Ibeams 74. A pair of sliding frames 75 are slidably moved upon the transversely disposed I-beams 7 4 and a bearing 76 is located upon each of said sliding frames, a drive shaft 77 being journaled in said bearings and provided with the usual loose and tight drive pulleys 78 and 79 respectively, said drive shaft being also provided with the pinion 80, which meshes with a gear 81, said gear being loosely mounted upon the crank shaft 82 and provided with an integral clutch member 83 adapted to be engaged by the fixed clutch member 84- for the purpose of causing the shaft to be rotated with the gear 81. The clutch member 8% is adapted to be thrown out upon the up stroke and upon the down stroke of the plunger 86. Suitable bearings 85 are provided upon the sliding frame 75 in which bearings the crank shaft 82 is journaled.

The plunger 86 of the hold down device, is supported from the sliding frames 75 by means of links 87 and 88, said links forming toggle joints which are operated by means of the pitlnan rod 89 mounted upon the crank shaft 82. said pitman rod having a head 90 pivotally connected thereto at 91, links 912 pivotally connecting the head to the toggle joints.

The plunger consists of a casting composed of side walls 93 and end walls 94, the lower link 88 of the toggle joints being pivotally connected to the toggle ioints as shown at 95. The side valls are tied together at intervals along their upper edges by means of bars 96, each of said bars having located thcrethrough a pair of bolts 97, said bolts being attached in any suitable manner to the bars 98, each of which bars is provided with the dove tailed lower portion 90, a tension spring being located around said bolt and between the ars 96 and 98. Slidably mounted upon the bars 08 are a pair of plates 101, said plates be ing provided with dove tailed slots 102 adapted to receive the dove tailed portions 99 of the bars 98.

For the purpose of moving the plates 101 to rard and away from each other in order to accommodate sheets of different width a screw threaded shaft 103 is located through a suitable bearing in one of the end plates 0t and provided with hand wheel 104, the screw threaded extremity of the shaft being located through a bearing 105, which is provided with a suitable internally screw thrmded aperture, said bearing 105 being located upon the bar 106 to which bar are pivotally connected at intervals, links 107, said links being also pivotally connected to the plates 101. By rotating the hand wheel the screw threaded shaft will cause the bar 106 to be moved longitudinally within the frame work of the hold down and through the links 107 will move the plates 101, upon the bars 98, toward or away from each other.

In order to adjust the hold down mechanism just described so that it may always be centrally located within the machine and that it may be adjusted whenever it is uere'isary to adjust the movable frame to receive different widths of sheets, an adjust ng means is provided comprising a pair of screw threaded shafts 108 and 109. said shafts being journaled in suitable bearings 110 and 111 respectively provided upon the angle bars 74, the inner screw threaded ex tremities of the shafts passing through the sliding frames 75. Sprocket wheels 112 and 113 are provided upon the shafts 108 and 100 respectively and are connected by means of a sprocket chain 114. a hand wheel 11.? being provided upon the shaft 108. Th s by operating the hand wheel 115 the two shafts 108 and 109 are operated in i-nison, the screw threaded extremities thereof operating within the screw threaded apertures 116 in the sliding frame 7;) and caus ing said sliding frames and the entire hold down mechanism which is carried thereby to be moved transversely within the machine.

The operation of the device is as follows z-A pack of sheets is conveyed into the machine by means of the conveyer chain said chain being stopped by the usual mechanism (not shown) wnen the pack has reached the proper position upon the bed plates of the machine. The hand levers which control the evcners are then perat d to position the pack properly beneath the shear blades. As soon as the pack is properly positioned upon the bed plates the levers are thrown into the normal position thus moving the angle bars 56 out of contact with the pack and the clutch 81 is thrown into engagement with the clut h member upon the gear 81 operating the crank shaft 82 and through the pitman rod 89 raising the head 00 and through the liulrs 02 straightening the toggle joints thus clamping the plates 101 of the plunger 86 irmly upon the pack and holding the same tioihtlv in position upon the bed plates. The pedal 28 is then depressed. throwing into operation the shea blades which descend in and sin'uiltaneously shear the two side edges of the pack. When the side edges of the sheet have been sheared the conveyor chain is again operated, carrying the pack away from the machine and carrying a new pack to the shears.

When it is desired to adjust the shears for a wider or narrower sheet the lever 50 is operated, throwing either of the pulleys 47 or 48 into engagement with the shaft 44. it

unison an an.)

depending upon whether it is desired to move the movable frame toward or away from the fixed frame. The hand wheel 115 must then be operated in order to bring the hold down device to the longitudinal center of the machine. The hand wheel 104 is then operated to move the plates 101 toward or away from each other as may be desired.

As hereinbefore mentioned any other suitable means of. driving the crank shafts 7 and 15 simultaneously in order to reciproate the shear blades 10 and 21 in unison may be employed. If desired a se iarate motor or other source of power may be attached to each of the crank shafts 7 and 15 and means may be provided by which both of said power shafts may be controlled by a single pedal or other device in order to operate both of the crank shafts simultaneously.

Although the drawings and above specification disclose the best mode in which I have contemplated embod v'ing my invention I desire to be not limited to the details of such disclosure, for, in the further practical application of my invention, many changes in form and construction may be made, as circumstances require or experience suggests, without departing from the spirit of the invention, within the scope of the appended claims.

I claim:

1. A machine of the character described, comprising two parallel frames, a crank shaft journaled in each of said frames, a shear blade being mounted for vertical reciprocation in each of said frames, pitman rods connecting said shear blades to said crank shafts, said shear blades being parallel and means for operating said crank shafts in unison.

2. A machine of the character described, comprising a bed plate adapted to receive a pack of sheets, a pair of parallel shear blades adapted to be rcciprocated in unison to trim two opposite edges of the pack simultaneously. a plunger adapted to clamp the pack firmly upon the bed plate when the shear blades are operated and means for adjusting said plunger horizontally between said shear blades.

3. A machine of the character described. comprising a fixed frame and a movable frame, means for adjusting said movable frame with relation to said fixed frame, a shear blade carried within said fixed frame, a second shear blade carried in said movable frame, said shear blades being parallel and adapted to be reciprocated in unison, a plunger adapted to clamp the pack firmly upon the bed plates when the shear blades are operated. and means for adjusting said plunger horizontally between said shear blades.

4:. A machine of the character described,

comprising a pair of parallel shear blades adapted to be reciprocated in unison, means for adjusting one of said shear blades toward or away from the other shear blade, a bed plate adapted to receive a pack of sheets to be sheared, an evencr adapted to locate the pack upon said bed plate and a plunger adapted to firmly clamp the pack upon said bed plate when said shear blades are operated.

5. A device of the character described, comprising a fixed frame, a bed plate carried upon said fixed frame, a shear blade adapted for vertical reciprocation within said fixed frame, a movable frame, a bed plate carried by said movable frame, a shear blade mounted for vertical reciprocation within said movable frame, means for reciprocating both of said shear blades in unison, stationary bearings located upon said machine, shafts located through said bearings, said shafts being provided with screw threaded cxtremitis which engage screw threaded apertures in the movable frame and means for rotating said screw threaded shafts in unison.

(3. A machine of the character described, comprising a fixed frame and a movable frame, means for adjusting said movable frame with relation to said fixed frame, a shear blade carried within said fixed frame, a second shear blade carried in said movable frame, said shear blades being parallel and adapted to be reciprocated in unison, a super-structure supported above said frames upon suitable standards, and a hold down horizontally slidably mounted upon said, SL1]')Q1Sl3111Ctll1C.

7. A machine of the character described, comprising a fixed frame and a movable frame, means for adjusting said movable frame with relation to said fixed frame, a shear blade carried within said fixed frame, a second shear blade carried in said movable frame, said shear blades being parallel and adapted to be reciprocated in unison, a super-structure supported above said frames upon suitable standards, a sliding frame mounted upon said superstructure, a plunger carried by said sliding frame and means for moving said sliding frame horizontally upon said superstructure.

8. A machine of the character described, comprising a fixed frame, a shear blade mounted for vertical reciprocation therein, a movable frame, a. second shear blade mounted for vertical reciprocation within said movable frame. said shear blades being arranged parallel, means for reciprocating said shear blades in unison, means for adjusting said movable frame with relation to said fixed frame, I-beams supported above said frames upon suitable standards, sliding frames mounted upon said I-beams, a plunger carried by said sliding frames,

means for reciprocating said plunger vertically and means for moving said sliding frames upon said I-beams.

9. A machine of the character described, comprising a pair of adjacent frames, a shear blade frame mounted for vertical reciprocation Within each of said adjacent frames, a shear blade carried by each of said shear blade frames, a bed plate located beneath said shear blade frames, an evener bar carried upon each of said shear blade frames and means for moving said evener bars toward or away from each other.

10. A machine of the character described, comprising a frame, a pair of parallel shear blades mounted for vertical reciprocation Within said frame, a bed plate mounted in said frame and adapted to receive a pack of sheets to be sheared by said shear blades, a plunger supported above said bed plate, toggle joints supporting said plunger and means for operating said toggle joints.

11. A machine of the character described, comprising a fixed frame, a shear blade mounted for vertical reciprocation therein, a movable frame, a second shear blade mounted for vertical reciprocation Within said frame, said shear blades being parallel, means for adjusting said movable frame with relation to said fixed frame, I-beams supported above said frames upon suitable standards, a sliding frame mounted upon said I-beams, means for moving said sliding frame upon said I-beams, toggle joints carried by said sliding frame, a plunger supported by said toggle joints and means for operating said toggle joints.

12. A machine of the character described, comprising a frame, a pair of parallel shear blades mounted for reciprocation Within said frame, a bed plate mounted beneath said shear blades, a crank shaft ournaled in said frame above said bed plate, toggle joints supported from said frame, a plunger supported by said toggle joints, a pitman rod connected to said crank shaft and links connecting said pitman rod to said toggle joints.

18. A machine of the character described, comprising a fixed frame, a bed plate mounted in said frame, a shear blade mounted in said frame, a movable frame, a shear blade mounted for vertical reciprocation Within said movable frame, a bed plate mounted in said movable frame beneath said second named shear blade, means for moving said movable frame with relation to said fixed frame, a plunger supported above said bed plates, means for moving said plunger vertically and means for adjusting said plungers horizontally between said shear blades.

14. A machine of the character described, comprising a pair of parallel shear blades adapted to be reciprocated in unison, means for adjusting one of said blades toward or away from the other shear blade, a bed plate adapted to receive a pack of sheets to be sheared, an evener adapted to locate the pack upon said bed plate, a plunger adapted to firmly clamp the pack upon said bed plate When said shear blades are operated and means for adjusting said plunger horizontally between said shear blades.

In testimony that I claim the above, I have hereunto subscribed my name in the presence of tWo Witnesses.

WILLIAM IV. IRWIN.

Witnesses:

J. H. BISHOP, SYLVIA BORON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

